Medicine: Mustard Plaster v. Light

Astounding it was to U. S. physicians, patients and therapeutic lamp
manufacturers to learn that the British Medical Research Council last
week decried the use of light treatments. There are two general kinds
of light used in medicineheat-producing, generated by carbon
filaments; and ultraviolet ray (artificial sunlight) producing,
generated by a carbon arc, by a mercury arc, or by special filaments
lighting through quartz. Undoubtedly such lights have done good. This
is particularly so of the ultraviolet light, used to overcome rickets
by direct exposure of puny children.